Valve



March 13, 1945. T F SAFFDY j 2,371,548

VALVE Filed Dec. e, 1943 JNVENTOR.

BvY

,7 Tray/WFM TLWTSWNQ `Patented Mar. 13, 1945 UNITED STATES PATENT OFFICE 2,371,548 y i VALVE Thomas F. Salady, Detroit, Mich. Application December 6, 1943,1Seral No. 513,053 4Claims. (Cl.`123'-177) This application relates to hollowfcoolant filled valves, such as are described in a prior application of mine, for Valve, Serial No. 513,052, filed December 6, 1943.

' I have observed that in such valves a vapor lock arises by virtue of the accumulation of vapor pressure in the head of the valve which interferes with free iiow of the coolant; to the head and the dome of the valve.

In this application I disclose a communicating by pass or relief tube within the valve for relieving vapor pressure in the head so that movement vof the coolant to the head and to the dome is facilitated. The hollow tube formed for this purpose may have its upper ends outwardly ared so that coolant is directed to the outer edges lof the valve head, where its presence is most urgently needed. The tube may be secured at its ends respectively to the dome and to the foot of the valve so as to provide a rigidifying strut extending between and connecting the dome and the foot of the valve, and may also be connected to the stem sides to form a strut against lateral forces.

A valve as made in accordance with the foregoing is disclosed in the appended drawing.

In this drawing,

Fig. 1 is an elevation section of a valve.

Fig. 2 is a transverse cross section on line 2 2 of Fig. 1.

The valve herein disclosed comprises initially separate stem, head, dome and foot portions I0, II, I2 and I4 respectively, integrally joined by welds at 20, 2|, and 22.

, The stem I is of tubing, and the head II and the dome I2 are stamped of thin sheet stock.

The valve is filled with coolant, shown at 23, which may be metallic sodium, liquefying under heat, as .when the valve is used as an exhaust valve in an internal combustion engine.

In this type of valve, and under the circum stances of use, there exists a tendency for vapors The tube may have its upper end fiared to The tube 25 has its upper and lower ends secured respectively, in any suitable manner to the dome I 2 and the foot I4, whereby it forms a rigid` ifying and connecting strut between these portions, in the direction of'the forces which move the tube ,up and down in the valve seat in the engine. Any suitable method or means for securing the ends of the tube to the dome and foot portionmay be utilized and the means shown are but representative.

Disposed in the annular space between the tube and the stem, and by the same token adapted to be disposed in the annular space between the tube and the head or the dome, are one or more spiders 29, (one only is shown) perforated to permit the coolant to circulate freely in the valve, but operating to brace the tube internally against transverse deflection;

When the valve is in operation, the coolant from time to time moves to the dome of the valve. l There is no vapor pressure in the head to interfere with this vfree circulation ofthe coolant. l

Now having described the valvev herein disclosed, reference should be had to the claims which follow.

I claim:

1. A hollow completely sealed coolant filled valve of the class described having means therein for providing a communicating by pass or relief means between the interior of the head, through the coolant, to the lower portion of the stem, remote from the head, for relieving vapor pressure in the head, and thus facilitating movement of the coolant into the head and to the dome, the means comprising a hollow tube extending through the coolant and having openings near l the head and near the foot of the valve, with the coolant being outside the tube.

2. A hollow completely sealed coolant lled valve of the class described having means therein for providing a communicating by pass or relief means between the interior of the head, through the coolant, to the lower portiony of the stem, remote from the head, ior relievingvapor pressure in the head, and thus facilitating vmovement of the coolant into the head and'to the dome, the means comprising a hollow tube extending through the coolant and having ropenings near the head and near the foot of the valve, with the coolant being outside the tube, the head end of the tube being outwardly flared.

3. A. hollow completely sealed coolant filled lvalve of the class described having means therein direct the coolant to the outer edges of the valve where its presence is most urgently needed.

vfor providing a communicating by pass or relief means between the interior of the head, through the coolant, to the lower portion of the stem, remote from the head, for relieving vapor pressure in the head, and thus facilitating movement of the coolant into the head `and to the dome,

the means comprising a hollow tube extending means between the interior of the head, through the coolant, to the lower portion of the stem, remote from the head, for relieving vapor pressure in the head, and thus facilitating movement of the coolant into the head and to the dome,

the means comprising a hollow tube extending through the coolant and having openings near the head and near the foot of the valve, with the coolant being outside the tube', and laterally extending means connecting the tube and the inside of the valve stem `to form lateral reinforcements.

THOMAS F. SAFFADY. 

